Chuck for polishing machines



Feb. 20, .1951 G. J. SODERBERG CHUCK FOR POLISHING MACHINES 2 Shee'ts-Sheet l Filed Aug. 3o, 194e JNVENTOR. GUSTA VE J. 50p/51255,@ G BY( MAU/W/ A TTOQ/VE V5 HQE Feb. 20, 1951 G. J. soDERBERG 2,542,158

CHUCK FOR POLISHING MACHINES Filed Aug. 30, 1946 2 Sheets-Sheet 2 t 1 JNVENToR. F i, .9 @usr/IVE J kSoil/ '--fe/QG BYSZ. l g

Patented Feb. 20, i951 UNITED STATES PATENT '0 FFI CE CHUCK FGR POLISHN G MACHINES .Gustave J. Soderberg, Babylon, N. Y.

Application August 30, 1'946, Serial' No. 693,893

l (Cl. 279-41) 2 Claims.

tv"'Ihis invention relates to polishing machines generally and Amore particularly .to portable motorized polishers suitable for polishing automobiles as well as for a great variety 4of household and industrial uses.

One object of `the invention is the provision of 'such a polishing .machine comprising .a .motor end anda polish-ing end-and a handle positioned intermediate such ends at the center .of .gravity ofthe machine so as to eliminate as far .as -possible all vibration upon the hand of .the user thus insuring against the scratching or .scoring of the surface being polished.

Another object of the invention is to provide such a polishing vdevice having a .simple yet highly efficient .chuck .for receiving .and holding a polishing disk.

A vfurther object :of .the invention is to provide a device of this nature lin which the polishing disk is so maintained .in place that it will .not :be affected by rotation.

' Still another object is :to .provide a polishing machine which is light in weight .and will .not tire the hand of the user.

-Another object :of the invention is to ,produce a polishing machine :of the nature described in which the maximum simplicity of construction and operation vis secured.

Other objects .and advantages Vvvill appear ;as the nature of the improvements .is better understood, .the invention :consisting substantiallyin the novel .arrangement Yand `corelati'on of parts herein fully described, .and illustrated in the accompanying drawings, wherein similar reference characters are .used to denote corresponding parts throughout the several views and then 'finally pointed out `and specifically dened in the appended claims.

The disclosure made the basis of exemplifying the .present inventive concept suggests a Apractical embodiment thereof, but the invention should not be restricted lto the exact details of this disclosure, and the latter, therefore, is to be understood from an illustrative rather than arestrictive standpoint. In carrying out the objects of the invention, it was found desirable to provide a polishing machine comprising a substantially light motor at one end and a gear driven chuck at the opposite end for receiving the -polishing disk. It was further found .advisable to enclose the gearingin a housing and connect `same to the motor by means of a handle so placed as to evenly divide the weight of the machine on b-oth sides thereof. Furthermore, it was found advantageous to provide a polishing disk which comprises a core or backing disk of any suitable material which 2 may be covered `or :enclosed by a replaceable polishing :cloth Ahaving an -elast-ically restricted mouth opening so as to be all times secu-rely held on the disk-Without the danger of its flying vkoff the disk regardless of the speed of its rotation.

The invention will appear more clearly from the fol-lowing detail description when taken. in connection with the accompanying drawings showing, by way `of example, preferred embodiments of the inventive idea.

. In the 1drawings:

Figure 1 is a side-elevation partly 'in lsectionef an apparatus embodying the present invention;

Figure 2 is an end view thereof partly broken awa-y `looking from the right `of .Figure 1; Y

Figure 3 vis an exploded perspective view of the polishing disk holding chuck;

Figure 4 is a perspective view of Ythe backing disk;

Figure 5 is a fragmental sectional view taken onv une .5 5 0f Figure 4; I

Figure 6 is a .fragmental sectional view of ga modified form .of .backing `.disk construction; 4

Figure 7 is a perspective view of .one form' of polishing cloth or lbag used;

Figures is a ,fragmental -sectional View at van .enlarged `scale taken on line '8 8 of rFigure 7; and

Figure 9 is a perspective view partly in-section of a Abrush adapted to be gripped by the chuck o f the machine.

Referring now to the drawings in detail, the numeral l @indicates a polishing .apparatus made in accor-dance with the Jpresent invention and comprises generally an electric motor |`I which `drives a chuck l2 'through gearing 1.3 enclosed in a split housing 1'4.

rIfhe motor frame or casing I'5 is provided with a sleeve I5 which' extends'into .the split housing M. The split 'housing '1"4 comprises abo'ttomjp'or tion l1 and an upper cover I8, the `tvvoparts being held together by screws i9. VThe motor H is provided with a shaft 20 which at its free end supports va bevel pinion 2l in mesh Ywith ta bevel gear 22 and a shaft 23 disposed at right angles 'to the motor shaft 2t. The shaft 23 is journalled in a ball'bearing 2li inthe'lower housing member I7 said bearing being held in place by va flanget'l collar 25 secured tothe housing member I1 by screws 26.

The shaft 23 carries'at its free end a collar 2i which lis maintained in place on said shaft Y*by means of a Aset `screw 28 and forms a part of the vc'huck'mechanism l2. The 'said chuck mechanism .l2 Yalso'includes a yclamping ldevice 2'9 comprising 'a pair of jaws or spring plates '3G and 311 joined 'at the top 'by a cross vmember 32 Lhaving a screw threaded hole 33 for the reception of a screw 34 which passes through the collar 21 and secures same to the bottom thereof. To further secure the clamping device 29 to the collar and to -prevent relative rotary movement between the said parts, the collar 21 is provided with a rectangular slot 35 into which the upper end 29a of the clamping device'ts. Theupper end of the clamping device is provided with a pair of upstanding arms or legs 35 which extend into recesses 31 in the sides of the collar 21, said recesses 31 opening into the slot 35 as shown in Figure 3. Screws 38 pass through perforations 39 in the legs 36 and thread into threaded openings 40 in the collar 21.

A screw or bolt 4| is secured to the jaw plate 30 intermediate the ends thereof and passes through a substantially semispherical raised shell portion 42 which is provided with four V shaped notches 43 angularly spaced apart at 90 from each other. A wing nut 44 having a pair of diametrically opposite teeth 45 are adapted to Snap into said notches when the wing nut is screwed down upon the screw 4I.

As afore mentioned, the machine is adapted to serve a variety of purposes, some of such purposes being accomplished by the use of polishing disks with dierent kinds of surfaces, such as, abrasive, nappy or smooth.

In Figures 1, 4, 5, '1 and 8 there is shown a polishing disk 46 which preferably comprises a felt backing disk 41 made up of a lower half or section 48 and an upper similar section 49 secured to each other near their peripheries by a row of stitches D. The upper layer 49 is provided with a slot 5I through which projects a substantially U-shaped tab or tongue 52. The tab 52 may be made of any suitable material. In the Figures l, 4, and 5 illustration the tab is shown as made of a strip of fabric which is folded over upon itself, the two folded plies being pasted or otherwise secured to each other, the lower ends being bent outwardly to form bases or legs 53 which may be sewn by stitching 54 to the upper disk layer 49.

In Figure 6 there is shown a modified form of the tongue construction and manner of securing same to the upper disk section 4 9. In this form o f the invention the tongue or tab 52a is made of metal and is secured by bolts and nuts 54 and 55 to the upper layer 49.

The combined disks 48 and 49 may support a polishing or bufting cloth or bag 56 made of suitable material, such as for instance fabric and may have a constricted mouth opening 51. The constricted mouth opening may be formed by inserting and tying at its ends, an elastic cord 58, in

a channel 59, the said channel being made from a folded over strip of cloth 60 sewn or otherwise secured to the bag 56 at the mouth thereof.

In Figure 9 there is shown a brush 6I provided with bristles 62 which may be made of wire, hair or of any artificial bers suitable for the purpose. A tab 52h is secured to the top `(i3 of the brush by means of bolts and nuts 64 and 65 respectively.

It will be seen that in all of the various polishing devices, a tab or tongue is suitably secured to such devices, the slot S in each case being wide enough to straddle the screw 4l of the clamping chuck 29. It will also be seen that due to the notches 43 and teeth 45 of the respective clamp elements 42 and 44 the tabs will be firmly held in the chuck as the wing nut 44 will be locked against accidental rotation by the said notch and tooth arrangement. Furthermore, it will be seen that due to the restricted elastically controlled mouth opening the buiing or polishing cloth or bag cannot ily off the backing disk regardless of the speed of its rotation.

The device as above described is provided with a handle I-I which is secured to the motor frame l5 and casing portion I8 by screws 66 at the center of gravity of the device and thus eliminate all vibrations upon the hand of the operator thus preventing the scratching or scoring of the surface being polished. A start and stop switch 61 for the motor Il is carried at the front of the handle as clearly shown in Figures l and 2.

From all of the foregoing it will be seen that the present invention provides an inexpensive yet highly efficient polishing device wherein the replaceable polishing or bufling cloth is securely held against a backing disk and will not be adversely affected by rotation. It will further be seen that the device is provided with a positive acting highly efncient clamping device adapted to tightly grip the tongues of the various polishing disks when inserted in position. Likewise it will be seen that the device is non scoring or scratching.

It is apparent that the specific embodiments have been given by way of illustration and not' by way of limitation, and that the structure above described is subject to wide variation and modification without departing from the scope and intent of the invention, all of which variations and modifications are to be included within the scope of the present invention. Y

What is claimed is:

l. A chuck comprising a collar, means securing the top of the collar to a rotary member and adapted to be rotated thereby, the collar comprising an upper cylindrical portion coacting with the rotary member and further comprising a lower portion of enlarged diameter, the upper portion having two spaced recesses formed in the rim, the recesses being downwardly extended f through the lower portion of enlarged diameter; a clamping device secured to the collar the clamping device comprising a pair of spaced apart plates, a cross member disposed at the top of the plates, an upright arm disposed at either end of the cross member and coacting with the spaced recesses extended through the lower portion of the collar, means releasably securing the upright arms in the recesses, and means adjusting at least the bottom portions of the spaced apart plates relative to each other.

2. A chuck comprising a collar, means securing the top of the collar to a rotary member and adapted to be rotated thereby, the collar having a radially directed slot in the base thereof and longitudinally directed recesses on either side aligned and communicating with the ends of the slot; a clamping device secured to the collar, the clamping device comprising a pair of spaced apart plates, a cross member disposed at the top of the plates, the central portion of the cross member being elevated above the ends and coacting with the radially directed slot in the base of the collar, an upright arm disposed at either end of the elevated portion of the cross member and coacting with the longitudinal recesses, means releasably securing the upright arms in the recesses and the elevated portion of the cross member in the slot, and means adjusting at least the bottom portions of the spaced apart plates relative to each other.

GUSTAVE J. SODERBERG.

(References onv following page) REFERENCES CITED Number Name Date The following references are of record in `the 1'519335 Rudolpl? et al Dec' 16 1924 me f his Paten 1329332 ,fgg A1111? T 1 `1. y y UNITED STATES PATENTS s 1,806,626 Hodgkins May 26, 1931 Number Name Date 1,903,355 Hodgkins May 9, 1933 221,991 Adamsv Nov. 25, 1379 2,014.1159 Stecker sept. 10, 1935 243,806 slate July 5, 1881 2,037,586 'i f Olson Apr. 14, 1936 529,510 Therrien Nov. 20, 1894 2133?;723: Lauretti May 5, 1936 763,380 Eble et al June 28, 1904 10 2,052,049 Cabana Nov. 24, 1936 1,304,413 Traill May 20, 1919 2,227,588 Kemp Jan. 7, 1941 1,335,616 synder Mar. 3o, 1920 2.4171629 soderberg Mar. 18, 1947 

